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/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
/* Includes */
#include "gap.h"
#include "common.h"
#include "gatt_svc.h"
/* Private function declarations */
inline static void format_addr(char *addr_str, uint8_t addr[]);
static void print_conn_desc(struct ble_gap_conn_desc *desc);
static void start_advertising(void);
static void set_random_addr(void);
static int gap_event_handler(struct ble_gap_event *event, void *arg);
/* Private variables */
static uint8_t own_addr_type;
static uint8_t addr_val[6] = {0};
static uint8_t esp_uri[] = {BLE_GAP_URI_PREFIX_HTTPS, '/', '/', 'e', 's', 'p', 'r', 'e', 's', 's', 'i', 'f', '.', 'c', 'o', 'm'};
/* Private functions */
inline static void format_addr(char *addr_str, uint8_t addr[]) {
sprintf(addr_str, "%02X:%02X:%02X:%02X:%02X:%02X", addr[0], addr[1],
addr[2], addr[3], addr[4], addr[5]);
}
static void print_conn_desc(struct ble_gap_conn_desc *desc) {
/* Local variables */
char addr_str[18] = {0};
/* Connection handle */
ESP_LOGI(TAG, "connection handle: %d", desc->conn_handle);
/* Local ID address */
format_addr(addr_str, desc->our_id_addr.val);
ESP_LOGI(TAG, "device id address: type=%d, value=%s",
desc->our_id_addr.type, addr_str);
/* Peer ID address */
format_addr(addr_str, desc->peer_id_addr.val);
ESP_LOGI(TAG, "peer id address: type=%d, value=%s", desc->peer_id_addr.type,
addr_str);
/* Connection info */
ESP_LOGI(TAG,
"conn_itvl=%d, conn_latency=%d, supervision_timeout=%d, "
"encrypted=%d, authenticated=%d, bonded=%d\n",
desc->conn_itvl, desc->conn_latency, desc->supervision_timeout,
desc->sec_state.encrypted, desc->sec_state.authenticated,
desc->sec_state.bonded);
}
static void set_random_addr(void) {
/* Local variables */
int rc = 0;
ble_addr_t addr;
/* Generate new non-resolvable private address */
rc = ble_hs_id_gen_rnd(0, &addr);
assert(rc == 0);
/* Set address */
rc = ble_hs_id_set_rnd(addr.val);
assert(rc == 0);
}
static void start_advertising(void) {
/* Local variables */
int rc = 0;
const char *name;
struct ble_hs_adv_fields adv_fields = {0};
struct ble_hs_adv_fields rsp_fields = {0};
struct ble_gap_adv_params adv_params = {0};
/* Set advertising flags */
adv_fields.flags = BLE_HS_ADV_F_DISC_GEN | BLE_HS_ADV_F_BREDR_UNSUP;
/* Set device name */
name = ble_svc_gap_device_name();
adv_fields.name = (uint8_t *)name;
adv_fields.name_len = strlen(name);
adv_fields.name_is_complete = 1;
/* Set device tx power */
adv_fields.tx_pwr_lvl = BLE_HS_ADV_TX_PWR_LVL_AUTO;
adv_fields.tx_pwr_lvl_is_present = 1;
/* Set device appearance */
adv_fields.appearance = BLE_GAP_APPEARANCE_GENERIC_TAG;
adv_fields.appearance_is_present = 1;
/* Set device LE role */
adv_fields.le_role = BLE_GAP_LE_ROLE_PERIPHERAL;
adv_fields.le_role_is_present = 1;
/* Set advertiement fields */
rc = ble_gap_adv_set_fields(&adv_fields);
if (rc != 0) {
ESP_LOGE(TAG, "failed to set advertising data, error code: %d", rc);
return;
}
/* Set device address */
rsp_fields.device_addr = addr_val;
rsp_fields.device_addr_type = own_addr_type;
rsp_fields.device_addr_is_present = 1;
/* Set URI */
rsp_fields.uri = esp_uri;
rsp_fields.uri_len = sizeof(esp_uri);
/* Set advertising interval */
rsp_fields.adv_itvl = BLE_GAP_ADV_ITVL_MS(500);
rsp_fields.adv_itvl_is_present = 1;
/* Set scan response fields */
rc = ble_gap_adv_rsp_set_fields(&rsp_fields);
if (rc != 0) {
ESP_LOGE(TAG, "failed to set scan response data, error code: %d", rc);
return;
}
/* Set non-connetable and general discoverable mode to be a beacon */
adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
/* Set advertising interval */
adv_params.itvl_min = BLE_GAP_ADV_ITVL_MS(500);
adv_params.itvl_max = BLE_GAP_ADV_ITVL_MS(510);
/* Start advertising */
rc = ble_gap_adv_start(own_addr_type, NULL, BLE_HS_FOREVER, &adv_params,
gap_event_handler, NULL);
if (rc != 0) {
ESP_LOGE(TAG, "failed to start advertising, error code: %d", rc);
return;
}
ESP_LOGI(TAG, "advertising started!");
}
/*
* NimBLE applies an event-driven model to keep GAP service going
* gap_event_handler is a callback function registered when calling
* ble_gap_adv_start API and called when a GAP event arrives
*/
static int gap_event_handler(struct ble_gap_event *event, void *arg) {
/* Local variables */
int rc = 0;
struct ble_gap_conn_desc desc;
/* Handle different GAP event */
switch (event->type) {
/* Connect event */
case BLE_GAP_EVENT_CONNECT:
/* A new connection was established or a connection attempt failed. */
ESP_LOGI(TAG, "connection %s; status=%d",
event->connect.status == 0 ? "established" : "failed",
event->connect.status);
/* Connection succeeded */
if (event->connect.status == 0) {
/* Check connection handle */
rc = ble_gap_conn_find(event->connect.conn_handle, &desc);
if (rc != 0) {
ESP_LOGE(TAG,
"failed to find connection by handle, error code: %d",
rc);
return rc;
}
/* Print connection descriptor */
print_conn_desc(&desc);
/* Try to update connection parameters */
struct ble_gap_upd_params params = {.itvl_min = desc.conn_itvl,
.itvl_max = desc.conn_itvl,
.latency = 3,
.supervision_timeout =
desc.supervision_timeout};
rc = ble_gap_update_params(event->connect.conn_handle, ¶ms);
if (rc != 0) {
ESP_LOGE(
TAG,
"failed to update connection parameters, error code: %d",
rc);
return rc;
}
}
/* Connection failed, restart advertising */
else {
start_advertising();
}
return rc;
/* Disconnect event */
case BLE_GAP_EVENT_DISCONNECT:
/* A connection was terminated, print connection descriptor */
ESP_LOGI(TAG, "disconnected from peer; reason=%d",
event->disconnect.reason);
/* Restart advertising */
start_advertising();
return rc;
/* Connection parameters update event */
case BLE_GAP_EVENT_CONN_UPDATE:
/* The central has updated the connection parameters. */
ESP_LOGI(TAG, "connection updated; status=%d",
event->conn_update.status);
/* Print connection descriptor */
rc = ble_gap_conn_find(event->conn_update.conn_handle, &desc);
if (rc != 0) {
ESP_LOGE(TAG, "failed to find connection by handle, error code: %d",
rc);
return rc;
}
print_conn_desc(&desc);
return rc;
/* Advertising complete event */
case BLE_GAP_EVENT_ADV_COMPLETE:
/* Advertising completed, restart advertising */
ESP_LOGI(TAG, "advertise complete; reason=%d",
event->adv_complete.reason);
start_advertising();
return rc;
/* Notification sent event */
case BLE_GAP_EVENT_NOTIFY_TX:
if ((event->notify_tx.status != 0) &&
(event->notify_tx.status != BLE_HS_EDONE)) {
/* Print notification info on error */
ESP_LOGI(TAG,
"notify event; conn_handle=%d attr_handle=%d "
"status=%d is_indication=%d",
event->notify_tx.conn_handle, event->notify_tx.attr_handle,
event->notify_tx.status, event->notify_tx.indication);
}
return rc;
/* Subscribe event */
case BLE_GAP_EVENT_SUBSCRIBE:
/* Print subscription info to log */
ESP_LOGI(TAG,
"subscribe event; conn_handle=%d attr_handle=%d "
"reason=%d prevn=%d curn=%d previ=%d curi=%d",
event->subscribe.conn_handle, event->subscribe.attr_handle,
event->subscribe.reason, event->subscribe.prev_notify,
event->subscribe.cur_notify, event->subscribe.prev_indicate,
event->subscribe.cur_indicate);
/* GATT subscribe event callback */
rc = gatt_svr_subscribe_cb(event);
if (rc == BLE_ATT_ERR_INSUFFICIENT_AUTHEN) {
/* Request connection encryption */
return ble_gap_security_initiate(event->subscribe.conn_handle);
}
return rc;
/* MTU update event */
case BLE_GAP_EVENT_MTU:
/* Print MTU update info to log */
ESP_LOGI(TAG, "mtu update event; conn_handle=%d cid=%d mtu=%d",
event->mtu.conn_handle, event->mtu.channel_id,
event->mtu.value);
return rc;
/* Encryption change event */
case BLE_GAP_EVENT_ENC_CHANGE:
/* Encryption has been enabled or disabled for this connection. */
if (event->enc_change.status == 0) {
ESP_LOGI(TAG, "connection encrypted!");
} else {
ESP_LOGE(TAG, "connection encryption failed, status: %d",
event->enc_change.status);
}
return rc;
/* Repeat pairing event */
case BLE_GAP_EVENT_REPEAT_PAIRING:
/* Delete the old bond */
rc = ble_gap_conn_find(event->repeat_pairing.conn_handle, &desc);
if (rc != 0) {
ESP_LOGE(TAG, "failed to find connection, error code %d", rc);
return rc;
}
ble_store_util_delete_peer(&desc.peer_id_addr);
/* Return BLE_GAP_REPEAT_PAIRING_RETRY to indicate that the host should
* continue with pairing operation */
ESP_LOGI(TAG, "repairing...");
return BLE_GAP_REPEAT_PAIRING_RETRY;
/* Passkey action event */
case BLE_GAP_EVENT_PASSKEY_ACTION:
/* Display action */
if (event->passkey.params.action == BLE_SM_IOACT_DISP) {
/* Generate passkey */
struct ble_sm_io pkey = {0};
pkey.action = event->passkey.params.action;
pkey.passkey = 100000 + esp_random() % 900000;
ESP_LOGI(TAG, "enter passkey %" PRIu32 " on the peer side",
pkey.passkey);
rc = ble_sm_inject_io(event->passkey.conn_handle, &pkey);
if (rc != 0) {
ESP_LOGE(TAG,
"failed to inject security manager io, error code: %d",
rc);
return rc;
}
}
return rc;
}
return rc;
}
/* Public functions */
void adv_init(void) {
/* Local variables */
int rc = 0;
char addr_str[18] = {0};
/* Make sure we have proper BT identity address set */
set_random_addr();
rc = ble_hs_util_ensure_addr(1);
if (rc != 0) {
ESP_LOGE(TAG, "device does not have any available bt address!");
return;
}
/* Figure out BT address to use while advertising */
rc = ble_hs_id_infer_auto(0, &own_addr_type);
if (rc != 0) {
ESP_LOGE(TAG, "failed to infer address type, error code: %d", rc);
return;
}
/* Copy device address to addr_val */
rc = ble_hs_id_copy_addr(own_addr_type, addr_val, NULL);
if (rc != 0) {
ESP_LOGE(TAG, "failed to copy device address, error code: %d", rc);
return;
}
format_addr(addr_str, addr_val);
ESP_LOGI(TAG, "device address: %s", addr_str);
/* Start advertising. */
start_advertising();
}
bool is_connection_encrypted(uint16_t conn_handle) {
/* Local variables */
int rc = 0;
struct ble_gap_conn_desc desc;
/* Print connection descriptor */
rc = ble_gap_conn_find(conn_handle, &desc);
if (rc != 0) {
ESP_LOGE(TAG, "failed to find connection by handle, error code: %d",
rc);
return false;
}
return desc.sec_state.encrypted;
}
int gap_init(void) {
/* Local variables */
int rc = 0;
/* Call NimBLE GAP initialization API */
ble_svc_gap_init();
/* Set GAP device name */
rc = ble_svc_gap_device_name_set(DEVICE_NAME);
if (rc != 0) {
ESP_LOGE(TAG, "failed to set device name to %s, error code: %d",
DEVICE_NAME, rc);
return rc;
}
return rc;
}
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